Locomotive



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W. J. HBFFEBNAN.

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IlNiTi-zn STATES VILLIAM J. HEFFERNAN,

,PATENT OFFICE.

OF ST. LOUIS, MISSOURI.

LocoMoTlvE.

SPECIFICATION forming part of Letters Patent No. 355,6S, dated January 4, 1887.

Application tiled September 19, 1885. Serial No. 177,603. (No model.)

panying drawings, forming part of this specification, in which- Figure 1 is a side elevation of my improved locomotive. Fig. 2 is a plan view of the same. Fig. 3 is a front elevation of the same, and

Fig. 4t is a transverse section'of one of the aircylinders.

Like letters of reference indicate like parts wherever they occur. l

In the drawings, A. representsa locomotive having the usual boiler, A', and driving-cyl inders C C.

Situate on and above the boiler B are the steam-cylinders D D, having pistons and piston-rods d d, which are connected with the crank-shaft E by connecting-bars d. The shaft E is journaled on journals mounted on the boiler, and is connected by suitable cams, yokes, and connecting-arms d2 with the valverods el", the valve-chambers (l5 being situate on the cylinders D, and are connected with the steam-dome byfpipes l,provided with athrottlc-valve, dl.

Keyed to the ends of the shaft E are wheels E', extending from which and pivoted thereto eccentrically are the connecting-rods e2 e2, which are connected with sliding heads e', to' which the piston-rods e of the air-compressing cylinders F F are connected. These cylinders F F are provided with suitable puppetvalves, f, (see Fig. 4,) for the admission of atmospheric air, and also discharge-pipes, also provided with similar puppet-valves, so that air may be forced from the lcylinders through the pipes by both strokes of the piston. These pipes G G lead from the compressing-cylinders to the air-chamber H, which chamber is preferably situate in the frame of the locomotive below the boiler.

It will be noticed that there are several pipes G, each of which may be provided with shutolf valves G', so that any one of them may be shut off for repairs.

Instead of the air passing directly from the atmosphere to the cylinders F F, it is delivprovided with the usual driving-cylinders, C

C, together withy the customaryvalves and other mechanism. The general motivepower applied in these cylinders, however, is not derived from steam passing to the cylinders, but by the supply-pipe n, which leads from the air-chamber H, preferably following the course of the usual steam-pipe, sothat the general arrangement of mechanism may be followed to the valve-chambers C. s

It is well known that 'in compressing air great heat is generated. To utilize this heat,

and to prevent it from causing injury, I form around the cylinders F F a Water-Jl acket, Z, and also around the air-chamber H, which jackets are connected by the pipes L L. The pipeL is connected' with the water-tank by suitable pipes 'and pump, the effect of which is to cause the water to flow through the j ackets and pipes, and thereby not only keep the cylindersF and chamber H cool, but to yheat the water which is supplied to the boiler.

In addition to the air-pipe leading from the chamber I-I to the cylinders C, the usual steampipe may be connected therewith, and a cutoff valve be provided, so as to cut off the air and turn on the steam.

I am aware that air-pumps operated by an auxiliary engine on locomotive-engines have been employed in connection with the driving-cylinders, and I do not desireto claim the same, broadly.

The advantages of my improvement are an increase in regularity of power and a saving of lost force through condensation.

Having thus described my invention, what I claim is.

ll. In a locomotive, the combination of the auxiliary steam-engine, the air-compressor op- IOC erated by the engine7 and an auxiliary blower and pipes connecting the air-chamber with lo for supplying air to the compressor, substanthe compressor and with the driving-cylinderstially as and for the purpose specified. of the locomotive, substantially as and for the 2. In a locomotive, the combination of au purpose specilied. 5 auxiliary steam-engine, a compressing air- "Witness my hand.

pump operated by the steam-engine7 acom- 5 VILLIAM J. HEFFERNAN. pressed-air chamber, an auxiliary blower op- Vitnesses: erated by thesteam-engine and connected with C. D. MOODY, the air-compressor so as to supply air thereto, '.T. W. HOKE. 

